Mr. Chou Fa-Kao (1915~1994),a famous linguist, devoted his life to Chinese linguistic research, who had made remarkable achievements on graphology, phonology, classical Chinese semantics, grammar, and annotations of ancient books. We can structur Mr. Chou's middle Chinese sounds system based on the following academic papers: "Textual Research on Xuanyin's Fanqie" " Research on Redundant Syllables in Rhyme Tables of Guangyun ", "Pronunciation and Evolution of Yu and Yu (魚虞) in Qieyun", "Chinese Transcription of Sanskrit words t and d", "Research on the Third Division Bilabials' First Characters in the Fanqie", "Research on the Third Division of Ancient Chinese Sounds and It's Spelling", "The Discussion of the Even and Uneven Tonal Categories", "Research on the Phoneme of Medieval Chinese", "Research on the Phonetic System of Qieyun", "Further Research on the Fanqie System of Xuanying", "Re-discussion on the Fanqie System of Xuanying", "Research on Redundant Syllables in Rhyme Tables' Fanqie from the Sui Dynasty, the Tang Dynasty", the Five Dynasties Period and the Early Years of the Song Dynasty" and so on. This sound system was one of the most representative systems of the last century.